Sending a letter?

I know this sounds very 'The Notebook' but I was talking to my mum about the fact me and this guy I like stopped talking and that I really miss him. She suggested that I send him a letter explaining everything that I can't really over text; the way I feel and how our months together did mean something. My friend also said it was a good idea. I'm just worried what if he doesn't care? Like he could've already moved on and not even thought of me, I would be so embarrassed🙈 should I just leave it and try to get over him in time or send a letter with the possibility of starting over this time with more communication? Thank you!🤗